The following are known Game Genie Codes for Ring King on Nintendo Entertainment System (NES).

• Unlimited Power In 1-Player Game
  GZEIPVVK
• Don’t Lose Stamina From Fighting
  GXKZXYOP
• Cut Timer To 30 Seconds
  LEOSLYTA
• Boost Timer To 90 Seconds
  PEOSLYTE
• Players Can’t Hurt Each Other!
  GXOZOIOP